Modular connector Nomenclature. Modular connectors are often referred to as modular phone jack and plug, RJ connector, and Western jack and plug. The term modular connector arose from ... British telephone socket Standard sockets were introduced, as part of the 'New Plan' wiring policy, to allow customers to easily purchase their own telephones, as required by Oftel, the phone ... How to Install an Ethernet Jack for a Home Network How to Install an Ethernet Jack for a Home Network with punch down wiring instructions and photos.